#include <stdio.h>

int main() {
  printf("Hello, World!\n");

  int x = 9;
  int y = 10;
  printf("%d\n", add(x, y));
  printf("%d\n", sub(x, y));
  return 0;
}
int sum(int a, int b) {
  printf("Hello, World!\n");
  return a + b;
}
int sub(int a, int b) { return a - b; }